include(FindPkgConfig)

find_program(VALAC valac)

function(add_vala_library libname)
  set(valasources ${ARGN})

  # Get the names of the C sources generated by the vala sources
  foreach(vs ${valasources})
    file(RELATIVE_PATH cs ${CMAKE_CURRENT_SOURCE_DIR} ${vs})
    string(REGEX REPLACE "\\.vala$" ".c" cs ${cs})
    set(csources ${csources} ${CMAKE_CURRENT_BINARY_DIR}/${cs})
  endforeach(vs)

  set(header ${CMAKE_CURRENT_BINARY_DIR}/${libname}.h)
  set(vapi ${CMAKE_CURRENT_BINARY_DIR}/${libname}.vapi)

  set_source_files_properties(${csources} ${header} ${vapi} PROPERTIES GENERATED 1)

  # Export the list of C sources
  set(${libname}_CSOURCES ${csources} PARENT_SCOPE)
  
  # Create --pkg= entries for command line
  foreach(pkg ${VALA_PACKAGES})
	  set(pkgs ${pkgs} --pkg=${pkg})
  endforeach(pkg)

  #message(DEPENDS ${valasources})
  #message(OUTPUT ${csources} ${CMAKE_CURRENT_BINARY_DIR}/${libname}.h ${CMAKE_CURRENT_BINARY_DIR}/${libname}.vapi)
  add_custom_command(
      DEPENDS ${valasources}
      OUTPUT ${csources} ${header} ${vapi}
      COMMAND ${VALAC} ${VFLAGS} ${pkgs} -C -H ${header} --library=${libname} ${valasources}
  )
endfunction(add_vala_library)

function(add_vala_program progname)
  set(valasources ${ARGN})

  # Get the names of the C sources generated by the vala sources
  foreach(vs ${valasources})
    file(RELATIVE_PATH cs ${CMAKE_CURRENT_SOURCE_DIR} ${vs})
    string(REGEX REPLACE "\\.vala$" ".c" cs ${cs})
    set(csources ${csources} ${cs})
  endforeach(vs)

  set_source_files_properties(${csources} PROPERTIES GENERATED 1)

  # Export the list of C sources
  set(${progname}_CSOURCES ${csources} PARENT_SCOPE)
  
  # Create --pkg= entries for command line
  foreach(pkg ${VALA_PACKAGES})
	  set(pkgs ${pkgs} --pkg=${pkg})
  endforeach(pkg)

  add_custom_command(
      DEPENDS ${valasources}
      OUTPUT ${csources}
      COMMAND ${VALAC} ${VFLAGS} ${pkgs} -C ${valasources}
  )
endfunction(add_vala_program)

# Requires a prefix: we cannot use TMP as internal prefix because
# pkg_check_modules will not overwrite variables which already exist, so
# add_packages would not be able to be called more than once
function(add_packages prefix)
  set(packages ${ARGN})

  pkg_check_modules(${prefix} REQUIRED ${packages})
  add_definitions(${${prefix}_CFLAGS})
  link_libraries(${${prefix}_LDFLAGS})

  #foreach(pkg ${packages})
  #  string(REGEX REPLACE "[><=].+" "" modname ${pkg})
  #  pkg_check_modules(TMP${modname} REQUIRED ${pkg})
  #  message("FOR ${pkg} CFLAGS ${TMP${modname}_CFLAGS} LIBS ${TMP${modname}_LDFLAGS}")
  #  add_definitions(${TMP${modname}_CFLAGS})
  #  link_libraries(${TMP${modname}_LDFLAGS})
  #endforeach(pkg)
endfunction(add_packages)